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SOLAR/1030-79/03 



Monthly 

Performance 

Report 



CHESTER WEST 
MARCH 1979 




U.S. Department of Energy 




National Solar Heating and 
Cooling Demonstration Program 

National Solar Data Program 



.NOTICE. 



This report was prepared as an account of work sponsored by the United States 
Government. Neither the United States nor the United States Department of Energy, nor 
any of their employees, nor any of their contractors, subcontractors, or their employees, 
make any warranty, express or implied, or assume any legal liability or responsibility for 
the accuracy, completeness or usefulness of any information, apparatus, product or 
process disclosed, or represents that its use would not infringe privately owned rights. 



MONTHLY PERFORMANCE REPORT 

CHtSTER WEST 

MARCH 1979 



I. SYSTEM DESCRIPTION 

The Chester West site is a single-family residence in Huntsville, Alabama. 
Solar energy is used for space heating the home and preheating domestic hot 
water (DHW). The solar energy system has an array of flat-plate collectors 
with a gross area of 225 square feet. The array faces south at an angle of 
49 degrees to the horizontal. A glycerol-water solution is used as the medium 
for delivering solar energy from the collector array to storage; water is the 
medium for delivering solar energy from storage to the space heating and hot 
water loads. Solar energy is stored aboveground in a 500-gallon water storage 
tank. Auxiliary space heating is provided by an air-to-air heat pump and 
electrical heating elements which are designed to function in parallel with 
the solar energy space heating loop. Auxiliary hot water heating is provided 
in series with the solar energy hot water heating loop through the use of 
electrical heating elements in an 80-gallon DHW tank. The system, shown 
schematically in Figure 1, has three modes of solar operation. 

Mode 1 - Collector-to-Storage : This mode activates when the control system 
senses a sufficient temperature difference between the collector and storage 
and remains active until the temperature difference drops below the accepted 
minimum. The collected energy is transferred to storage through a ring- type, 
liquid-to-liquid heat exchanger located in the storage tank. Pump PI is 
operating. 

Mode 2 - Storage- to-Space Heating : This mode activates when there is a demand 
for space heating. Solar energy is circulated to the conditioned space by 
solar-heated water from storage through a liquid-to-air heat exchanger located 
in the air-distribution duct. Pump P3 is operating. 

Mode 3 - Storage- to-DHW Tank : This mode activates when the control system 
senses a sufficient temperature difference between storage and the DHW tank, 
and remains active as long as a sufficient temperature difference exists. 
Water circulates from the top of storage through a liquid- to-liquid heat 
exchanger located in the bottom of the DHW tank. Pump P2 is operating. 

II. PERFORMANCE EVALUATION 



INTRODUCTION 

The site was occupied during the month of March; however, the solar energy 
system was not completely operational during the month. The DHW subsystem was 



zff.S- 1 



HI! 







turned off from March 7 through March 26. A new storage tank was installed on 
March 1. A malfunctioning liquid flowmeter in the DHW loop rendered some of 
the DHW and storage performance factors invalid. The liquid flowmeter in the 
space heating loop also malfunctioned; however, it was possible to analyze all 
space heating performance factors by using air rather than liquid flow. Data on 
the space heating component indicated a solar fraction of 33 percent, and an 
electrical energy savings of 0.33 million Btu. 

WEATHER CONDITIONS 

During the month, total incident solar energy on the collector array was 
9.5 million Btu for a daily average of 1356 Btu per square foot. This was 
about the same as the estimated average daily solar radiation for this geogra- 
phical area during March of 1347 Btu per square foot for a south-facing plane 
with a tilt of 49 degrees to the horizontal. The average ambient temperature 
during March was 54°F as compared with the long-term average for March of 
51 °F. The number of heating degree-days for the month (based on a 65°F 
reference) was 330, as compared with the long-term average of 461. The number 
of cooling degree-days was 16, as compared with the average of 21. 

THERMAL PERFORMANCE 

Collector - The total incident solar radiation on the collector array for the 
month of March was 9.5 million Btu. During the period the collector loop 
was operating the total insolation amounted to 8.2 million Btu. The total 
collected solar energy for the month of March was 3.7 million Btu, resulting 
in a collector array efficiency of 40 percent, based on total incident insola- 
tion. There were two instances when the collector loop malfunctioned: 1) It 
turned on on March 9, but stayed on continuously until it turned off on 
March 11; 2) it turned on on March 21, but ran continuously until midnight. 
There were some energy losses during these periods. Operating energy required 
by the collector loop was 0.40 million Btu. 

Storage - The average storage temperature for the month was 127°F. 

DHW Load - The DHW subsystem consumed an unknown amount of solar energy and 
1.2 million Btu of auxiliary electrical energy to satisfy a hot water load of 
1.1 million Btu. The DHW subsystem consumed a total of 0.087 million Btu of 
operating energy. A daily average of 62 gallons of DHW was consumed at an 
average temperature of 131°F delivered from the tank. 

Space Heating Load - The space heating subsystem consumed 0.73 million Btu of 
solar energy and 1.3 million Btu of auxiliary electrical energy to satisfy a 
space heating load of 2.2 million Btu. The solar fraction of this load was 
33 percent. The space heating subsystem consumed a total of 0.18 million Btu 
of operating energy, resulting in an electrical energy savings of 0.33 million 
Btu. 



OBSERVATIONS 

Unreliable liquid flowmeters limited the performance evaluation of this site. 
Both flowmeters became fouled with debris from the old storage tank and suffered 
a scum buildup attributed to the corrosive reaction of the metals and liquid 
in the system. 

ENERGY SAVINGS 

The space heating subsystem contributed an electrical energy savings of 0.33 
million Btu. 



III. ACTION STATUS 

Boeing is investigating various approaches to solve the liquid flowmeter 
problem. The use of filters to purge the system of debris and the use of 
additives to impede corrosion are being considered. 







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